轨道带电在地面行驶的游乐设施,如儿童小火车等,轨道电压应不大于()V。
A、24
B、36
C、50
D、220
参考答案:C
—Look, those great notebooks are __________in our school store. Let’s have a look.
—OK. Anybody can __________ the prices.
A.sell, buy
B.sell, afford
C.on sale, afford
D.on sale, sell
治疗消化性溃疡疗效最好的抑酸药是().
A.丙谷胺
B.洛赛克
C.派吡氮平
D.法莫替丁
E.米索前列醇